how does an impulses travel through a neuron what exactly is happening
Answers
Answer:
Nerve impulse transmission across synapse takes place by
1. Neurosecretion and
2. Chemoreception.
Synaptic transmission is achieved by use of neurochemicals.
Synapse has three structural entities:
presynaptic axonic terminal/knob,
synaptic cleft and
postsynaptic dendritic terminal/membrane.
Synaptic impulse transmission takes place from presynaptic to postsynaptic neuron.
When nerve impulse reaches presynaptic terminal, calcium ions flow in. This prompts secretory vesicles stored inside axonic terminal to burst and release neurohumor substances in synaptic cleft.
Neurohumor molecules act as neurotransmitters, and are of different types: acetylcholine, serotonin, etc. Neurotransmitter molecules diffuse through synaptic cleft and reach dendritic terminal.
Postsynaptic dendritic membrane ramains associated with specific receptors for specific neurohumor. Attachment of neurohumor to receptor causes depolarisation and a new action potential is formed in the postsynaptic neuron.
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